Safety pressure relief valve



Jan. 1, 1946. c. STERN SAFETY PRESSURE RELIEF VALVE Filed June 8, 1944 2Sheets-Sheet 1 INVENTOR. CHARLES STERN firm/away Jan. 1, 1946. Q STERN2,392,009

SAFETY PRESSURE RELIEF VALVE Filed June 8, 1944 2 Sheets-Sheet 2 .0 Q 924 76 iaf Y! N 0 5 1'! 5 b8 '21 i 71 L 15 I f l b0 IO g),

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INVENTOR.

CHARLES STERN A TTO/QNEY Patented Jan. 1, 1946 2,392,009'SAEEfD-YPRhSSUREitEIJEEYALYE ii e le die 1 iti't il. Appiica ti on il es 1944; serial No. 39,295] 8pm. p fner engines to relieveexcssixie"pressnre therein, and

described hailing a Valve-member 'adapted to be seated oria vaiveseat;acnlp, adapted to be: pressed against the valve" niemper'py ems-pressuresupplied to said device, and spring "means" normally ui'fgiii'gthecupaway from "the valve member to permit itto become nnseat'ed.

Yet another object of this inventionto provide in a device-of thecharacter described, "'a

piston 'within said cup, and ascrew threaded stem "screwed tbthe valvebody and passing through"the piston and adapted to 'retain'the Ipiston'against movement, and-said stern having a pa'slsag topermit'fiuid under pressure to enter the c-up and said stem furthermore;being adapted'ttdb'e screwed against thecupfto press the vaive membera'gainst its. slot.

Yet another object: of thisinvention is to provide a compact, ruggedand'durabledevicevof the character described whichshail be'relatiyelyrinexpensive to manufacture, smooth. and positive j pe ation.ndretip a t cal nd v fl cientto a hi h d g ee i us o he bieets q i su vei ncwill in p t. be obr a a and in 9& e Q i t v f ointed O t:

The invention accordingly consists inflthe'feavtures of constrncti oncombinations of elements,

and arrangement ofparts whichttviilbe exemiplified inthefcdnstriictionhereinafter described, and of which the'jscope of'applicationflwill .be. indicated in the followihg -claims.

In t e. ,e m any i s dr wi in t w i h is own me tit e i is usrasibleliil etiv r mbe i i ien s sin e t on,

"Fig; 11" is. an elevati 'n'jal cross-sectional view of a de ce e bod nt e ptention; v

F at-1 is a sme pew the e f: h' i is a to p anner th reof;

Fig. 4*is' a c'ross sectional view taken on line -51 an: 7 LFig' axistv' similar to Fig. 1, but showin the valve member retained in seatedcondition onthev'alveseatf" Referring 'now' in detail-to the drawings,'10

designates a safety pressure relief device embodying the-invention."'-I'-he'1san1eco-mprises abody H closed at its 'lowe end :by a base28,"Body. II has a cylindrical portion I2 formed with-=5, .bottom flangel3and having; longitudinal slots '.l'2a. At the upper end iof theicylinderi l 2 his a trans-v verse wall. .forn'ied withacentrai openingl5. Extending upwardly from the wall- M is ra.-U.- shaped wall rl'fiformingvzaxrelief. passage 1 Lopening to one side of. the body.

Extending. from the- U i-f'shaped Mali; J 6 is a hub l8 .forme d ,.-withexternalutpipe threads I 9.. Hub I8 is provided .Withia .centralthroughapassage 20 formedflat its. lowelt endswith a Naive seat 1! .oropening Ecommnnicatin iwith the passage] L. At h pper 4 end .of through;opening.:2fl. is an: .en- Iar-ged openin formin arsieat for. a erididisclinsertcd therein. The. grid 24.5mm comprise a metal disc torn/ledwithzslots' 2L1 achedto flan e. 13 at t e iowertend of: the body llisthe sbase 2 8. Base ;28--;and flangeJB a e r ist n p in s to receivthe at achi e olt 3! at eour orners thereof -Ba 8 f med i h -icentral; xal: hre ehvs w threaded opening 3!. It is ais ior ned dia 93 n t e imers siet eseo z;

'Hi 32 i r met w th e in a itiiq med 'w 1v read. .e c-itsou ereeq-s Connctin and is mallncli eeio eein .35:

low t per f ee aselii- "S r wed wi n mi 131: azm t hr d Q m' The stem 40has anjinterniedi ate screw threaded portion 4| receiving the threadsgofppening S -I' At l a n f tem istommdfifl is anut'head 43 for receiving awrench to turn the screw. Atthe upper end; ofrod!!! is an enlarged head41. It wiii;.be.nc ted that the screw threads of threaded portionljterminate short of the, headv l'l. The rod .-Al1 -isforrnedwithanannular intermediate groove 43-pin; into the screw t ded n fi nt ere ris od'isalso formed with a diametricscrgw open' s 5 v-y tqm in with thegrooye flit Said rod is iurthermore formed, with an agial opening 5 Iextending from opening'50 to thenii fi ffnd oithe.v rod. When the piston.rod stem, orwscrew A0. is in the po si tion shown in Fighl,openinggflspornmnnicates witmgroove .50., .airiiosaor air pi 53 oranyfcoridnittosupply, fluid l9 Ssure to the deyice Fluid 'pressii'resiich" as airo'r" steain' inaythnspass sition.

through opening 33 through opening 36, groove 48, opening 50, andpassage to a point above the piston rod 40.

At the upper end of the piston rod and disposed within the cylinder I2is a piston 55. The same is formed with a through opening 56 to looselyreceive the upper end of the piston rod. At the upper end of the opening56 is an enlarged opening 5'! to receive the head 41 of the piston rod.The piston 55 may be formed with spaced external grooves 58 to receivepiston rings Received on the piston 55 and contacting the piston rings58 is a piston cup 60. The cup 60 has a cylindrical wail 6| closed atthe top by a top wall 62. It is formed at its lower end with anoutwardly extending flange 63. Surrounding the cup 60 and interposedbetween flange 63 and the under surface of transverse wall I4 is aspring '65 normally urging the cup 60 downwardly.

0n the top wall 62 of the cup 60 is a valve member 68. The samecomprises a cylindrical portion 69\passing through opening [5, and thesame is formed with a flange 16 at its lower end. At the upper end ofcylindrical portion 69 is a tapered surface ll adapted to seat on thevalve seat 2|.

The hub I8 is adapted to be screwed into a screw threaded opening 15 ofa wall 16. The wall 16 may be the cylindrical wall of a steam cylinderor the wall of any other vessel for fluid under pressure which it isdesired to relieve when the pressure exceeds a predetermined amount.

Fig. 1 shows the safety device in operative po- Fluid pressure entersthe cup 6!] and presses the same upwardly against the pressure of spring65 for retaining valve member 68 in seated condition. The upwardpressure on the valve member 68 is normally greater than the pressurewithin the vessel. However, should the pressure within the vessel exceeda predetermined amount, it will unseat member 68 and pressure will berelieved through passage H. The piston rings 59 seal the-air within thecup. If there is any leakage or air pressure through the screw threadsof the rod 40 and the threaded opening 3|, such pressure will bedissipated through slots 12a.

It will be noted that the rod 40 is normally screwed down as far as itcan go keeping the piston 55 down on the base. A gasket 55a'may beinterposed between the piston and the base. If pressure to the safetydevice is cut off and there is no pressure within the steam cylinder,spring 65 will press the cup down to retain the safety device open. Ifpressure to hose or pipe 53 is not, available and if it is neverthelessdesired to keep the valve closed, piston rod 40 may be screwed up to theposition shown in Fig. 6, where it presses against the underside of thetop wall 62 of the cup to press valve member 68 against the valve seat2|.

It will be noted that when the piston rod 40 is in the position shown inFig. 1 threads of the piston rod 40 will engage threads of the openingI! on opposite sides of the groove 48 so as to keep air pressure fromthe underside of the piston 55.

It will thus be seen that there is provided a device in which theseveral objects of this invention are achieved, and which is welladapted to meet the conditions of practical use. Q

As various possible embodiments might be made of the above invention,and as various changes might be made in the embodiment above set forth,it is to be understood that all matter herein set forth or shown in theaccompanying drawings is to be interpreted as illustrative and not in alimiting sense.

Having thus described my invention, I claim as new and desire to secureby Letters Patent:

1. A safety cylinder device, comprising a body, said .body having acylindrical portion, and a flange at the lower end of the cylindricalportion and being formed with a transverse wall at the upper end of saidcylindrical portion, said transverse wall being formed with a centralopening, said body having a passage opening to one side of the body andcommunicating with said opening, said body having a valve opening formedwith a valve seat and communicating with said passage, a valve memberextending through said opening and across said passage and being adaptedto be seated on said valve seat, to close said valve opening, a cupwithin said cylinder contacting said valve member, a piston within saidcup contacting the inside of the latter, a base attached to the flangeat the lower end of the cylinder and formed with a, screw threadedopening, said piston being formed with a through opening, and a pistonrod passing through the opening in the piston, and being screwed to thethreaded opening in the base, said piston rod being formed with apassage leading to the inside of the cu and said passage being adaptedto be shut off upon adjusting said piston longitudinally of its axis.

said body having a passage opening to one side of the body andcommunicating with said opening, said body having a valve opening formedwith a valve seat and communicating with said passage, a valve memberextending through said opening and across said passage and being adaptedto be seated on said valve seat, to close said valve opening, a cupwithin said cylinder contacting said valve member, a piston within saidcup contacting the inside of the latter, a base attached to the flangeat the lower end of the cylinder and formed with a screw threadedopening, said piston being formed with a through opening, and a pistonrod passing through the opening in the piston, and being screwed to thethreaded opening in the base, said piston rod being formed with anannular groove, and with a diametric through opening communicating withsaid groove and with an axial passage connecting said transverse openingwith the upper end of the rod, and said base being formed with anopening communicating with the screw threaded opening thereof, andadapted to register with the annular groove in said rod.

3. A safety relief device, comprising a body formed with a valve seat, avalve member to close said seat, a cup contacting said valve member, aspring interposed between said cup and said body, a piston within saidcup, a member longitudinally adjustable relative to said body, andpassing through the piston, and being adapted in one position thereof topermit movement of the cup, and in another position thereof to retainthe cup against movement, and means to supply fluid under pressure tosaid cup when said'memher is in the first-mentioned position, and toshut off fluid pressure when said member is in the latter position.

4. A safety relief device, comprising a body formed with a valve seat, avalve member to close said seat, a cup contacting said valve member andformed with an outwardly extending flange at its open end, a springmounted on the cup and interposed between said flange and said body, apiston within said cup, and a member screwed relative to said body, andpassing through the piston, and being adapted in one position thereof topermit movement of the cup, and in another position thereof to retainthe cup against movement, said member being formed with a passage tocarry fluid under pressure to the inside of the cup.

5. A safety relief device, comprising a body formed with a valve seat, avalve member to close said seat, a cup contacting said valve member andformed with an outwardl extending flange at its open end, a springmounted on the cup and interposed between said flange and said body, apiston within said cup, and a member screwed relative to said body, andpassing through the piston, and being adapted in one position thereof topermit movement of the cup, and in another position thereof to retainthe cup against movement, said member being formed with a passage tocarry fluid under pressure to the inside of the cup, and means to shutoff said passage in one position, to said member.

6. A pressure relief device, comprising a body having a recess open atone end, a flange at the open end of the recess, a transverse wall atthe opposite end of said recess, said transverse wall being formed withan opening, said body being formed with a relief passage communicatingwith said opening, and extending to the exterior of the body, and thebody furthermore being formed with a hub having a through passage formedwith a valve seat adjacent said relief passage, a base attached to theflange to close the open end of the recess, said base being formed witha central screw threaded opening communicating with said recess, andwith an opening to receive a conduit for supplying fluid under pressure,and communicating with an intermediate portion of said screw threadedopening, a screw stem screwed within said screw threaded opening, apiston within the recess received on said stem, a cup shaped member onsaid piston, and a valve member on said cup shaped member passingthrough the opening in the transverse wall, and being adapted to beseated on said valve seat, said screw stem being formed with a passageto connect said conduit with the interior of said cup,

and said passage being adapted to be shut off in one position of saidscrew stem.

7. A pressure relief device, comprising a body having a recess open atone end, a flange at the open end of the recess, a transverse wall atthe opposite end of said recess, said transverse wall being formed withan opening, said body being formed with a relief passage communicatingwith said opening, and extending to the exterior of the body, and thebody furthermore being formed with a hub having a through passage formedwith a valve seat adjacent said relief passage, a base attached to theflange to close the open end of the recess, said base being formed witha central screw threaded opening communicating with said recess, andwith an opening to receive a conduit for supplying fluid under pressure,and communicating with an intermediate portion of said screw threadedopening, a screw stem screwed within said screw threaded opening, apiston within the recess received on said stem, a cup shaped member onsaid piston, a valve member on said cup shaped member passing throughthe opening in the transverse wall, and being adapted to be seated onsaid valve seat, and a spring on said cup shaped member interposedbetween said flange and said transverse Wall.

8. A pressure relief device, comprising a body having a recess open atone end, a flange at the open end of the recess, a transverse wall atthe opposite end of said recess, said transverse wall being formed withan opening, said body being formed with a relief passage communicatingwith said opening, and extending to the exterior of the body, and thebody furthermore being formed with a hub having a through passage formedwith a valve seat adjacent said relief passage, a base attached to theflange to close the open end of the recess, said base being formed witha central screw threaded opening communicating with 7 said recess, andwith an opening to receive a conduit for supplying fluid under pressure,and communicating with an intermediate portion of said screw threadedopening, a screw stem screwed within said screw threaded opening, apiston within the recess received on said stem, a cup shaped member onsaid piston, a valve member on said cup shaped member passing throughthe opening in the transverse wall, and being adapted to be seated onsaid valve seat, a spring on said cup shaped member interposed betweensaid flange and said transverse wall, said stem having a head at one endengaging said piston, and said stem being formed with an annular groove,and with a diametric passage communicating with the groove, and with anaxial passage connect= ing the diametric passage with the headed end ofsaid stern,

CHARLES STERN.

